International Linear ParksI.L.P.ConferenceInternational Linear ParksI.L.P., Parkways: Past, Present, and Future, Appalachian State University, 1 listopada 2017, DOI: 10.2307/j.ctt1xp3kv8, ISBN 978-1-4696-4205-5, JSTOR: j.ctt1xp3kv8. Brak numerów stron w książce
International Linear ParksI.L.P.ConferenceInternational Linear ParksI.L.P., Parkways: Past, Present, and Future, Appalachian State University, 1 listopada 2017, DOI: 10.2307/j.ctt1xp3kv8, ISBN 978-1-4696-4205-5, JSTOR: j.ctt1xp3kv8. Brak numerów stron w książce
